Nuclear Spin Symmetry Conservation Studied for Symmetric Top Molecules (CH3D, CHD3, CH3F, and CH3Cl) in Supersonic Jet Expansions

0507582 - ÚFCH JH 2020 RIV US eng J - Článek v odborném periodiku
Horká-Zelenková, Veronika - Seyfang, G. - Dietiker, P. - Quack, M.
Nuclear Spin Symmetry Conservation Studied for Symmetric Top Molecules (CH3D, CHD3, CH3F, and CH3Cl) in Supersonic Jet Expansions.
Journal of Physical Chemistry A. Roč. 123, č. 29 (2019), s. 6160-6174. ISSN 1089-5639. E-ISSN 1520-5215
Institucionální podpora: RVO:61388955
Klíčová slova: ground vibrational-state * high-resolution * theoretical investigations * rovibrational analysis * nu(2)+2-nu(3) subband * infrared-spectroscopy
Obor OECD: Physical chemistry
Impakt faktor: 2.600, rok: 2019
Způsob publikování: Omezený přístup

We report results on nuclear spin symmetry conservation studied by high resolution spectroscopy of relative line intensities for the A and E nuclear spin isomers of symmetric top molecules CHD3, CH3D, CH3F, and (CH3Cl)-Cl-35 in supersonic jet expansions with He and Ar as carrier gases. Infrared absorption spectra were measured around 3000 cm(-1) by an infrared (lead salt) diode laser and a continuous wave IR-OPO (infrared optical parametric oscillator) locked to a frequency comb. A detailed analysis of the R(2)-line intensities of the CH-stretching fundamental shows that nuclear spin symmetry is conserved for CHD3, CH3F, and (CH3Cl)-Cl-35 during the expansion. For CH3D, a small contribution from nuclear spin symmetry relaxation cannot be excluded completely under our experimental conditions.
Trvalý link: http://hdl.handle.net/11104/0298571